Microbiology Exam 3 - Rio Salado
Questions With Complete Solutions
Which method can be used for long-term storage? - ANSWER lyophilization
Which of the following is an antiseptic that may be inactivated by some skin bacteria? -
ANSWER Hydrogen peroxide
What is the premise behind pasteurization? - ANSWER It makes products safer to consume.
Which of the following would be used to sterilize glassware that will be used in a microbiology
lab? - ANSWER Autoclave
Antibiotics such as Streptomycin and Erythromycin stop bacterial infections because they
prevent the bacterial cell from doing which of the following? - ANSWER Assembling
polypeptides
Which of the following is a difference between penicillin and a vancomycin? - ANSWER Penicillin
interferes with an enzyme involved in cell wall synthesis, whereas vancomycin does not
Semisynthetic antibiotics differ from natural antibiotics because of which of the following? -
ANSWER Natural antibiotics are derived from nature
Which of the following is the difference between soaps and quats? - ANSWER Quats can kill
microbes
,Why should meat be thawed in the refrigerator? - ANSWER it will decrease the possibility of
bacteria growth as it thaws
Antibiotic "A" and antibiotic "B" are both effective at suppressing an infection in a patient,
however together, they have an even more significant effect. This is due to which of the
following? - ANSWER Synergistic interactions
What is the difference between commercial sterilization and sterilization using a sterilant? -
ANSWER A sterilant would be used on a surface
Polymyxin E is useful against gram-negative bacteria because of which of the following? -
ANSWER It breaks down the outer membrane
Which test can determine if a disinfectant is contaminated? - ANSWER In-use test
Dry heat and moist heat differ because of which of the following? - ANSWER Moist heat
penetrates cells more effectively
Using a narrow-spectrum antibiotic is better than a broad-spectrum antibiotic because of which
of the following? - ANSWER Narrow-spectrum antibiotics will have less of a chance of killing
normal microbiota
A person is hiking and runs out of drinking water. They find a stream and decide to use the
chlorine tablets they brought to sanitize the water. This would be a good way to make the water
safe to drink because of which of the following? - ANSWER The chlorine will break up the
molecules of the microbes in the water
When a phlebotomist cleans an area of the skin with alcohol before drawing blood on a patient,
their goal is to do which of the following? - ANSWER Lower the number of bacteria on the skin
,Why is washing your hands with (non-antibacterial) soap and water an effective way to reduce
bacteria? - ANSWER It is degerming your hands
Which of the following would target Mycobacterium tuberculosis? - ANSWER Isoniazid
Mouthwash, antibacterial soap, and Lysol are all related because of which of the following? -
ANSWER They contain phenolic compounds
Which of the following would be the least selectively toxic treatment for a bacterial infection? -
ANSWER Polymyxin B
Which of the following would be used to control microbial counts in a liquid that could not be
exposed to heat? - ANSWER Filtration
If a person has athlete's foot, the cream they use to treat it will suppress the mold enough for
the immune defenses to rid the skin of the infection because of which of the following? -
ANSWER The cream is fungistatic
Why can quinolones target bacterial replication? - ANSWER Bacteria have different enzymes
Which scientist's research showed penicillin was an effective antibiotic in treating infections in
animals? - ANSWER Chain
what microbes can be pathogenic? - ANSWER protozoa, fungi, bacteria, helminths, viruses
what are most infections caused by? - ANSWER bacteria or viruses
is illness the same as disease - ANSWER no
, what does infection mean? - ANSWER infection means that. person has been colonized with a
microbial population
most bacteria that cause disease in humans are ___ - ANSWER mesophilic
what control microbial growth? - ANSWER heat
how does heat affect cells? - ANSWER denaturation of proteins
the intensity depending on time, temp, and moisture
kill means - ANSWER complete death of a microbe
bactericidal - ANSWER indicated that bacterial population is dead
bacteriostatic - ANSWER this means the population is low and not increasing in size
sterilzation - ANSWER completely kill everything which is not always neccessary
sanitize - ANSWER reduce the population to food safe levels
cooking food can ____ - ANSWER kill most bacteria that will cause infection
S. aureus - ANSWER can replicate and produce toxins that will remain after the food Is heated if
the toxin is in/on the food prior to cooking
Questions With Complete Solutions
Which method can be used for long-term storage? - ANSWER lyophilization
Which of the following is an antiseptic that may be inactivated by some skin bacteria? -
ANSWER Hydrogen peroxide
What is the premise behind pasteurization? - ANSWER It makes products safer to consume.
Which of the following would be used to sterilize glassware that will be used in a microbiology
lab? - ANSWER Autoclave
Antibiotics such as Streptomycin and Erythromycin stop bacterial infections because they
prevent the bacterial cell from doing which of the following? - ANSWER Assembling
polypeptides
Which of the following is a difference between penicillin and a vancomycin? - ANSWER Penicillin
interferes with an enzyme involved in cell wall synthesis, whereas vancomycin does not
Semisynthetic antibiotics differ from natural antibiotics because of which of the following? -
ANSWER Natural antibiotics are derived from nature
Which of the following is the difference between soaps and quats? - ANSWER Quats can kill
microbes
,Why should meat be thawed in the refrigerator? - ANSWER it will decrease the possibility of
bacteria growth as it thaws
Antibiotic "A" and antibiotic "B" are both effective at suppressing an infection in a patient,
however together, they have an even more significant effect. This is due to which of the
following? - ANSWER Synergistic interactions
What is the difference between commercial sterilization and sterilization using a sterilant? -
ANSWER A sterilant would be used on a surface
Polymyxin E is useful against gram-negative bacteria because of which of the following? -
ANSWER It breaks down the outer membrane
Which test can determine if a disinfectant is contaminated? - ANSWER In-use test
Dry heat and moist heat differ because of which of the following? - ANSWER Moist heat
penetrates cells more effectively
Using a narrow-spectrum antibiotic is better than a broad-spectrum antibiotic because of which
of the following? - ANSWER Narrow-spectrum antibiotics will have less of a chance of killing
normal microbiota
A person is hiking and runs out of drinking water. They find a stream and decide to use the
chlorine tablets they brought to sanitize the water. This would be a good way to make the water
safe to drink because of which of the following? - ANSWER The chlorine will break up the
molecules of the microbes in the water
When a phlebotomist cleans an area of the skin with alcohol before drawing blood on a patient,
their goal is to do which of the following? - ANSWER Lower the number of bacteria on the skin
,Why is washing your hands with (non-antibacterial) soap and water an effective way to reduce
bacteria? - ANSWER It is degerming your hands
Which of the following would target Mycobacterium tuberculosis? - ANSWER Isoniazid
Mouthwash, antibacterial soap, and Lysol are all related because of which of the following? -
ANSWER They contain phenolic compounds
Which of the following would be the least selectively toxic treatment for a bacterial infection? -
ANSWER Polymyxin B
Which of the following would be used to control microbial counts in a liquid that could not be
exposed to heat? - ANSWER Filtration
If a person has athlete's foot, the cream they use to treat it will suppress the mold enough for
the immune defenses to rid the skin of the infection because of which of the following? -
ANSWER The cream is fungistatic
Why can quinolones target bacterial replication? - ANSWER Bacteria have different enzymes
Which scientist's research showed penicillin was an effective antibiotic in treating infections in
animals? - ANSWER Chain
what microbes can be pathogenic? - ANSWER protozoa, fungi, bacteria, helminths, viruses
what are most infections caused by? - ANSWER bacteria or viruses
is illness the same as disease - ANSWER no
, what does infection mean? - ANSWER infection means that. person has been colonized with a
microbial population
most bacteria that cause disease in humans are ___ - ANSWER mesophilic
what control microbial growth? - ANSWER heat
how does heat affect cells? - ANSWER denaturation of proteins
the intensity depending on time, temp, and moisture
kill means - ANSWER complete death of a microbe
bactericidal - ANSWER indicated that bacterial population is dead
bacteriostatic - ANSWER this means the population is low and not increasing in size
sterilzation - ANSWER completely kill everything which is not always neccessary
sanitize - ANSWER reduce the population to food safe levels
cooking food can ____ - ANSWER kill most bacteria that will cause infection
S. aureus - ANSWER can replicate and produce toxins that will remain after the food Is heated if
the toxin is in/on the food prior to cooking
